Warp crossing means for circular weaving looms



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United States Patent WARP CROSSING MEANS FOR CERCULAR WEAVING LOMS Oscar Lariviere, Flixecourt, lFrance, assigner to Socit dite: Saint Freres, Socit Anonyme, Paris, France Application February 19, 1952, Serial No. 272,407

Claims priority, application France February 21, 1951v Claims. (Cl. 139-13) At the crossing of warp thread sheets in a circular weaving loom and notably where the threads contain straw particles or is irregularly spun, the threads in the one sheet are liable to clinch with those'in the other sheet, notably in the vicinity of the funnel where they are closer to one another. Now, such a clinging is the cause of most of the weaving faults which are found in fabrics woven on circular looms.

The present invention has for its object a contrivance for use on circular weaving looms which s adapted to delay the crossing of the warp thread sheets in the vicinity of the funnel in such a manner that it will subsequently occur quite rapidly and by the action of a comparatively high pull, whereby the aforesaid clinches and the consequent inconveniences are avoided.

With this end in view, in a preferred embodiment of the invention, the shuttle extends rearwards in a stern adapted to delay the crossing of the threads in the zone comprised between said funnel and said stem. The stem is located at some distance from the funnel, e. g. quarter way tohalf Way between the funnel and the shuttle race.

An embodiment of the present invention is illustrated by way of example in the appended drawing.

Figure 1 is a plan view.

Figures 2 to 5 are sectional views taken respectively on lines II-II, III-III, IV-IV and V-V in Fig. 1.

The shuttles 1 are guided by the race 4 between the heddles 5 which raise and lower the warp threads 6 to make the shed; they lay a weft thread in the bottom of the shed; each shuttle 1 is followed with a stem arranged substantially in the median plane of the shed.

As shown in Figs. 2 to 4, the shed is open in the radial planes through the middle portion of the shuttle (see Fig. 2); it begins to close in the radial planes through the rear portion of the shuttle (see Fig. 3) although it is prevented from completely doing so by the shuttle itself; the crossing is effected normally in the radial plane shown in Fig. 4, i. e. behind the shuttle, at a time when the warp threads are stressed to the least; the shed will then open again in the reverse direction after the sheets have crossed each other, thus allowing the next shuttle to hunt its way through and to assist the opening of the shed in the radial planes through the vfore end of the shuttle (see Fig. 5).

Owing to the provision of the stem 2 the threads cannot cross one another in the area comprised between said stem 2 and the funnel 3 in the radial plane shown in Fig. 5; at that point the crossing of the threads has already been achieved in that portion of the shed which extends to the outside of the stern 2, where the threads ICC lie sufficiently wide apart to allow the said crossing to proceed easily; consequently, the threads are subjected to a comparatively high pull, and as soon as they are no longer held apart by the rear portion of the stem they will cross one another abruptly, or at any rate quite rapidly, whereby the liability of the threads to clinch is avoided.

In arrangements of the prior art clinches between the threads belonging to either sheet could occur in the sector indicated at b in Fig. 1 while according to the invention the said sector is no wider than a as indicated in said gure.

The 'crossing is also assisted owing to the fact that it occurs by threads whereas in conventional arrangements it occurs by frames.

It is to be understood that the embodiment of the invention described hereinbefore with reference to the appended drawings is only given for the purpose of eX- empliiication and by no means of limitation and that many modifications may be made therein without departing from the scope of the invention, notably as far as the arrangement and shape of the stem are concerned.

What I claim is: l, in a circular weaving loom provided with a central cylindrical funnel, in which the shed occupies a horizontal mean position and including a plurality of shuttles contributing to open the shed by having the sheets rested thereon, the provision on the rear end of each shuttle, between the same and the funnel, of a stem extending the shuttle rearwards to a point beyond the nose of the next following shuttle and arranged substantiallyin the median plane of the shed.

2. In a circular loom, a central cylindrical funnel, a concentric shuttle race surrounding and spaced from said funnel and having a plurality of vertically extending slots to receive warp thread sheets, the threads of said sheets radiating out from said funnel and converging inwardly, being closer together adjacent said funnel, said sheets forming a shed which occupies a horizontal mean portion, a plurality of shuttles running on said race, each of said shuttles having a stem projecting rearwardly from said funnel and adapted to delay the crossing of the warp threads in the space between said stem and funnel, said stem being offset horizontally from the longitudinal center line of said shuttle so as to be closer to said funnel than to said race.

3. A loom according to claim 2, in which said stem is located in the median plane of the shed at one quarter to one half of the distance from said funnel to said race.

4. A loom according to claim 3, in which said stem is located about one third of the distance from said funnel to said race.

5. A loom according to claim 2, in which said stem of each shuttle extends rearwardly beyond the forward end of the next following shuttle.

References Cited in the le of this patent UNITED STATES PATENTS 2,248,282 Pelce July 8, 1941 2,433,479 Pelce Dec. V30, 1947 2,582,392 Pelce Ian. 15, 1952 FOREIGN PATENTS 977,340 France Nov. 8, 1950 

